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经营范围
发明名称
The Permission preventive method of malicious incoming call using the PINPersonal Identification Number on automatic collect call service
摘要
申请公布号
KR100621738(B1)
申请公布日期
2006.09.06
申请号
KR19990060886
申请日期
1999.12.23
申请人
发明人
分类号
H04M15/00
主分类号
H04M15/00
代理机构
代理人
主权项
地址
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